CN103279154B - A kind of intelligent temperature control circuit - Google Patents
A kind of intelligent temperature control circuit Download PDFInfo
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- CN103279154B CN103279154B CN201310239068.0A CN201310239068A CN103279154B CN 103279154 B CN103279154 B CN 103279154B CN 201310239068 A CN201310239068 A CN 201310239068A CN 103279154 B CN103279154 B CN 103279154B
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Abstract
The present invention patent discloses a kind of intelligent temperature control circuit, and electric capacity C1, resistance R1, resistance R4 and temperature sensor are all connected with described NE555 trigger U1; One end of described temperature sensor is also connected between described resistance R3 and stabilivolt D2; The grid of described MOS switching tube Q1 is connected with described resistance R4, and the drain electrode of described MOS switching tube Q1 is connected with described electric calorifie installation, and the source electrode of described MOS switching tube Q1 is connected with the negative pole of described power supply; Between the grid that described stabilivolt D3 is connected to described MOS switching tube Q1 and source electrode; After described resistance R2 and described stabilivolt D1 are in series and are connected, described resistance R3 and described stabilivolt D2 be all connected between the both positive and negative polarity of power supply by overheat switch M1 after being in series and being connected.A kind of intelligent temperature control circuit of the present invention, has that circuit is simple, production cost is low, has temperature memory function and do not need after making power-off restarting to reset the advantages such as temperature range.<!--1-->
Description
Technical field
Patent of the present invention relates to a kind of intelligent temperature control circuit.
Background technology
On existing market sales applications temperature control chip be mostly adjustable, although the control of different temperatures scope can be applied to, because it does not generally have setting data memory function.Have no progeny in Power supply, temperature control chip will restart, and can only recover original factory data after restarting temperature control chip, needs to reset temperature range, for needing the product setting fixed temperature scope, is inconvenient on the contrary use.
Summary of the invention
Patent of the present invention is for avoiding the weak point that exists in above-mentioned prior art, providing a kind of intelligent temperature control circuit, can keep the data of temperature setting range after making power-off restarting.
Patent of the present invention be technical solution problem by the following technical solutions.
A kind of intelligent temperature control circuit, its design feature is, comprises power supply, NE555 trigger U1, MOS switching tube Q1, electric calorifie installation, temperature sensor, resistance R1 ~ R4, stabilivolt D1 ~ D3 and electric capacity C1; Described electric capacity C1, resistance R1, resistance R4 and temperature sensor are all connected with described NE555 trigger U1; One end of described temperature sensor is also connected between described resistance R3 and stabilivolt D2.The grid of described MOS switching tube Q1 is connected with described resistance R4, and the drain electrode of described MOS switching tube Q1 is connected with described heating wire, and the source electrode of described MOS switching tube Q1 is connected with the negative pole of described power supply; Between the grid that described stabilivolt D3 is connected to described MOS switching tube Q1 and source electrode; Described resistance R2 and described stabilivolt D1 are connected between the both positive and negative polarity of power supply after being in series and being connected, described resistance R3 and described stabilivolt D2 are connected to after being in series and being connected between the both positive and negative polarity of power supply.
The design feature of a kind of intelligent temperature control circuit of patent of the present invention is also:
Described a kind of intelligent temperature control circuit also comprises overheat switch; Described overheat switch is in series with described power supply and is connected.
Described electric calorifie installation is heating wire.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The intelligent temperature control circuit of patent of the present invention, comprises power interface, NE555 trigger U1, MOS switching tube Q1, electric calorifie installation interface, temperature sensor, resistance R1 ~ R4, stabilivolt D1 ~ D3 and electric capacity C1; This attemperating unit chip design simplifies, and production cost reduces greatly, has memory function, does not need to reset temperature range after power-off, is easy to operation.
Because this circuit overall adopts the Schmidt trigger of NE555 chip formation as control section.Input voltage by little be increased to 1/3Vcc time, export and become high level from low level; Input voltage, by when being reduced to greatly 2/3Vcc, exporting and becomes low level from high level.Because institute control temperature is interval only relevant with resistance R1 bleeder circuit to the thermistor of institute serviceability temperature sensor, namely this interval is determined by circuit hardware, there is one-to-one relationship, still can keep the control effects in former design temperature interval after power-off restarting, embody good memory and memory function.Change thermistor and its divider resistance can realize adjustment and the control in different temperatures interval.
Patent of the present invention is a kind of intelligent temperature control circuit, has that circuit is simple, production cost is low, has temperature memory function and do not need after making power-off restarting to reset the advantages such as temperature range.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of intelligent temperature control circuit of patent of the present invention.
Fig. 2 is the circuit diagram of a kind of intelligent temperature control circuit of patent of the present invention.
Below by way of embodiment, and by reference to the accompanying drawings patent of invention is described further.
Embodiment
See accompanying drawing 1 ~ Fig. 2, a kind of intelligent temperature control circuit comprises power supply, NE555 trigger U1, MOS switching tube Q1, electric calorifie installation, temperature sensor, resistance R1 ~ R4, stabilivolt D1 ~ D3 and electric capacity C1; Described electric capacity C1, resistance R1, resistance R4 and temperature sensor are all connected with described NE555 trigger U1; One end of described temperature sensor is also connected between described resistance R3 and stabilivolt D2.The grid of described MOS switching tube Q1 is connected with described resistance R4, and the drain electrode of described MOS switching tube Q1 is connected with described heating wire, and the source electrode of described MOS switching tube Q1 is connected with the negative pole of described power supply; Between the grid that described stabilivolt D3 is connected to described MOS switching tube Q1 and source electrode; Described resistance R2 and described stabilivolt D1 are connected between the both positive and negative polarity of power supply after being in series and being connected, described resistance R3 and described stabilivolt D2 are connected to after being in series and being connected between the both positive and negative polarity of power supply.
Described a kind of intelligent temperature control circuit also comprises overheat switch M1; Described overheat switch M1 is in series with described power supply and is connected.
Described electric calorifie installation is heating wire.
Described resistance R2 and described stabilivolt D1 is connected between the both positive and negative polarity of power supply again after being in series and installing overheat switch additional, described resistance R3 and described stabilivolt D2 is connected to after being in series and installing overheat switch additional between the both positive and negative polarity of power supply again.
If control temperature is set in 10 DEG C---within the scope of 30 DEG C, then in accompanying drawing 1 ~ Fig. 2, each element model specification is as follows:
U1---NE555 flip-flop chip; Q1---N-channel MOS pipe IRF540N; R1---resistance 3.9k Ω; R2---resistance 10k Ω; R3---10k Ω; R4---resistance 100 Ω; C1---electric capacity 10n; D1---stabilivolt 1N733A; D2---stabilivolt 1N4740A; D3---stabilivolt 1N4747A; M1---overheat switch RS-9700A.
The Schmidt trigger that this circuit overall adopts NE555 chip to form is as control section.Input voltage by little be increased to 1/3Vcc time, export and become high level from low level; Input voltage, by when being reduced to greatly 2/3Vcc, exporting and becomes low level from high level.
Input voltage be temperature sensor and R1 series connection time R1 on dividing potential drop.According to this hysteresis device principle, when only need make two ultimate temperatures, the dividing potential drop of R1 reaches 1/3Vcc and 2/3Vcc respectively, output level changes, make the conducting of MOS switching tube or cut-off, to control the duty of electric calorifie installation, thus just can realize the adjustment within the scope of two temperatures.According to the thermistor characteristic of institute's serviceability temperature sensor, consider the range of temperature of chip power and the two trigger voltage relations that will realize and requirement, take following scheme: when getting R1=3.9k Ω, chip power is 5V, input element total voltage is 10V, when then thermistor is 19.5k Ω and 7.8k Ω, input can reach two trigger voltages.According to the thermistor characteristic of institute's serviceability temperature sensor, by the environment temperature of thermosensitive resistance measurement heating arrangement periphery, now temperature high-low limit value is respectively 10 DEG C and 30 DEG C, can realize temperature and change within the scope of 30 DEG C at 10 DEG C.Temperature starts heating lower than 10 DEG C, and temperature stops heating higher than when 30 DEG C.
R1 two ends input voltage by little be increased to 1/3Vcc time, export and become high level from low level, make metal-oxide-semiconductor conducting by NE555 chip controls, start heating.Input voltage, by when being reduced to greatly 2/3Vcc, exporting and becomes low level from high level, by NE555 chip controls, metal-oxide-semiconductor is ended, and stops heating.
Powering for realizing single power supply in addition, using stabilivolt D1 and D2 to obtain chip power and input element voltage.D3 plays the effect of protection MOS switching tube.R2, R3 are used for current limliting, ensure that stabilivolt normally works.
Institute control temperature is interval only relevant with resistance R1 bleeder circuit to the thermistor of institute serviceability temperature sensor, namely this interval is determined by circuit hardware, there is one-to-one relationship, still can keep the control effects in former design temperature interval after power-off restarting, embody good memory and memory function.Change thermistor and its divider resistance can realize adjustment and the control in different temperatures interval.
Described a kind of intelligent temperature control circuit also comprises overheat switch; Described overheat switch is in series with described power supply and is connected.Use RS-9700A type bimetal type switch as overheat switch, break-off signal can be selected to be the product of about 70 degree.The parameter of RS-9700A type bimetal type switch is as follows: voltage range: 0-250V AC/DC universal, range of current: within 0 ~ 5A, slider material: silver-plated contact, serviceable life: >10 ten thousand times.By adopting overheat switch, make when temperature exceedes preset temperature numerical value, power supply to be disconnected, can not be overheated and burn with protection circuit.Described overheat switch carries out specification by actual requirement and selectes, and guarantees the safe handling of circuit and product.
Chip according to a kind of intelligent temperature control circuit manufacture described in patent of the present invention can be used for the Based Intelligent Control having specific environment temperature range to require: ensure that specific environment temperature is lower than Automatic-heating time certain minimum setting value (minimum 10 DEG C as set in above-described embodiment), automatically heating arrangement is closed, to ensure that certain environment temperature maintains in particular range when reaching certain the highest setting value (as the highest 30 DEG C in what set in above-described embodiment).
Claims (2)
1. an intelligent temperature control circuit, comprises power supply, NE555 trigger U1, MOS switching tube Q1, electric calorifie installation, temperature sensor, resistance R1, resistance R2, resistance R3, resistance R4, stabilivolt D1, stabilivolt D2, stabilivolt D3 and electric capacity C1;
Described electric capacity C1, resistance R1, overheat switch M1 are all connected with described power supply, and wherein said electric capacity C1 and resistance R1 is connected to the negative pole of described power supply, and described overheat switch M1 is connected in series in the positive pole of described power supply;
It is characterized in that:
Described resistance R2 and described stabilivolt D1 are connected between the both positive and negative polarity of power supply by described overheat switch M1 after being in series and being connected, and described resistance R3 and described stabilivolt D2 are connected between the both positive and negative polarity of power supply by described overheat switch M1 after being in series and being connected;
One end of described temperature sensor is connected between described resistance R3 and stabilivolt D2;
The power input of described NE555 trigger U1 is connected between resistance R2 and stabilivolt D1;
The grid of described MOS switching tube Q1 is connected with the power output end of described NE555 trigger U1 by described resistance R4, and the source electrode of described MOS switching tube Q1 is connected with the negative pole of described power supply; Between the grid that described stabilivolt D3 is connected to described MOS switching tube Q1 and source electrode;
One end of described electric calorifie installation is connected with resistance R1 with the drain electrode of described MOS switching tube Q1 respectively, and the other end of described electric calorifie installation is connected with described power supply by described overheat switch M1;
Described resistance R1 is connected with described NE555 trigger U1 by described electric capacity C1;
Resistance R4 is all directly connected with described NE555 trigger U1 with the other end of temperature sensor;
Described MOS switching tube Q1 is N-channel MOS pipe;
Described temperature sensor comprises thermistor;
Only relevant with resistance R1 to described thermistor between the temperature-controlled area of intelligent temperature control circuit.
2. a kind of intelligent temperature control circuit according to claim 1, is characterized in that, described electric calorifie installation is heating wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310239068.0A CN103279154B (en) | 2013-06-17 | 2013-06-17 | A kind of intelligent temperature control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310239068.0A CN103279154B (en) | 2013-06-17 | 2013-06-17 | A kind of intelligent temperature control circuit |
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| CN103279154A CN103279154A (en) | 2013-09-04 |
| CN103279154B true CN103279154B (en) | 2016-03-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104317331A (en) * | 2014-09-19 | 2015-01-28 | 北京中电兴发科技有限公司 | Pre-heating control device and pre-heating control method based on optical MOS relay |
| CN105487573B (en) * | 2014-09-21 | 2017-09-22 | 邓加慧 | Automatic temperature control device |
| CN108245005A (en) * | 2018-01-05 | 2018-07-06 | 陈炳华 | A kind of rice roll machine structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4505600A (en) * | 1982-11-18 | 1985-03-19 | Nittan Company, Ltd. | Temperature sensor |
| CN101963817A (en) * | 2009-07-21 | 2011-02-02 | 神讯电脑(昆山)有限公司 | Constant-temperature heating system |
| CN102749944A (en) * | 2012-07-11 | 2012-10-24 | 广州市埃特斯通讯设备有限公司 | Constant-temperature device on microwave reading and writing controller |
| CN203276067U (en) * | 2013-06-17 | 2013-11-06 | 尚诚德 | Intelligent temperature control circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5563410A (en) * | 1978-11-07 | 1980-05-13 | Matsushita Electric Ind Co Ltd | Temperature control unit |
| CN201212960Y (en) * | 2008-07-02 | 2009-03-25 | 北京联合大学 | Linear constant temperature controller |
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2013
- 2013-06-17 CN CN201310239068.0A patent/CN103279154B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4505600A (en) * | 1982-11-18 | 1985-03-19 | Nittan Company, Ltd. | Temperature sensor |
| CN101963817A (en) * | 2009-07-21 | 2011-02-02 | 神讯电脑(昆山)有限公司 | Constant-temperature heating system |
| CN102749944A (en) * | 2012-07-11 | 2012-10-24 | 广州市埃特斯通讯设备有限公司 | Constant-temperature device on microwave reading and writing controller |
| CN203276067U (en) * | 2013-06-17 | 2013-11-06 | 尚诚德 | Intelligent temperature control circuit |
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